Vinted users have been reacting angrily following a change that caused products showing incorrect sizing.
The second-hand shopping app has updated its measurement guidelines for female and kids' apparel but did not contact all users about the change.
Countless users and merchants are posting online saying Vinted listings now show a modified sizing category versus the original listing as a result of the reclassification.
The company said the new system was more in line with other platforms.
They have suggested members to check their listings and update the measurements by hand where appropriate, causing user dissatisfaction.
Earlier, the sizing featured a single numeric size and a letter, for instance S/8 or M/10.
The updated approach includes a letter and a range such as S/UK 8-10.
For certain items, the sizing has been recategorised - such as a large size used to be a 12 but now shows as UK 16-18.
One content creator, who produces content about larger sizing, explained the modification "makes transactions more difficult".
"Few clothing companies classify XL as 20-22," as the platform currently indicates.
Another user, based in Glasgow, explained products she uploaded with size 14 tags were appearing on the platform as size 20–22.
"Should someone sized 20-22 purchase these they're going to be very disappointed," she stated.
Another shopper, from Derby, explained she became annoyed due to the update requiring manual adjustment the measurements for "each individual item".
"Personally, this is quite irritating, as I'm chronically ill and Vinted sales have been crucial for me since losing part of my income," she explained.
The platform boasts over 100 million shoppers, comprising 18 million UK members.
It has become a favored option compared to resale services such as eBay and Depop.
This represents another occasion that an unexpected update on the platform has faced criticism: earlier, the platform withdrew an update concerning shipment methods due to shopper criticism.
Elena Hartwell is a multidisciplinary artist and educator passionate about fostering creative communities in London.